SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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13
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9
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15
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6
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Detailed explanation-1: -Answer and Explanation: In one formula unit of Al(NO3)3, there would be nine atoms of oxygen.
Detailed explanation-2: -In 1 formula unit of Al(NO3)3, there are (clearly!) 9 atoms of oxygen, 3 nitrogen atoms, and 1 aluminum atom. I have gone on before that the mole ( NA, Avogadro’s number) is simply a much larger number, i.e. NA = 6.022×1023 . So, in 1 mole of Al(NO3)3 there are (9 × NA) O atoms precisely.
Detailed explanation-3: -This means that one formula unit of aluminum nitrate has nine oxygen atoms.
Detailed explanation-4: -There is one aluminium atom. 3×(NO3) 3 × ( N O 3 ), having 3 nitrogen atoms and 9 oxygen atoms. Hence one unit of aluminium nitrate contains total 13 atoms: 1 atom of aluminium.
Detailed explanation-5: -NO3 is the nitrate ion. It consists of a nitrogen atom and three oxygen atoms.